I'm 46, male, 5'10, a cyclist, and weighed 160 lb at the start of my Whole30 (152 on day 40).
I hit an energy wall on day 14, after low intensity playing outside with my son. I just wanted to go inside and rest. I assumed that was "normal" for that stage, so didn't make any changes.
But this type of reaction has persisted, so I decided to extend my Whole40 to see if I would get through this. A few more recent examples:
Day 35: Went bowling with 2 others and bowled 2 games. I was exhausted from bowling!
Day 38: Did 1 set of 50 push-ups before meal 1 (probably took 75-90 seconds). After the meal, was starting my PT exercises and wanted to go back to bed!
Am I doing something wrong, or do I just need to keep going a while longer until I get my energy back?
On the cycling side, I have only been doing short rides (60-90 minutes) during my Whole30, partly because I didn't want to overdo it, but also because I'm recovering from an injury. I've noticed that on some of the rides, I feel like a slug for at least half the ride, but feel fine for the final part of the ride. Day 39 was one such ride, where there was a slight headwind on my way out, and I felt like I was going to die. My times were the worst ever. When I would push it hard for 15-20 strokes to make it through a stale green light, it felt like I could hardly keep going after that. After I turned around, though, at around the 35-38 minute mark, I started feeling better and had best or second-best times in many sections on the way back. I wouldn't say that I had gobs of energy, but I was able to ride at a higher sustained pace.
I haven't tracked my food daily over these last 40 days, but I can give you what I've had for the last 2+ days, plus a sampling of foods I've had the rest of the time. Most of my food has come from the Well Fed and Well Fed 2 recipes.
Large helping Well Fed 2 Italian Pork Roast
1 C Cauliflower "Rice" Pilaf (no actual rice in there)
sm serving fruit salad
Meal 1 (finished maybe 15 minutes pre-ride):
1/3 of a large sweet potato, julienned and cooked in gobs of ghee (2-3T?)
2 eggs, fried in ghee
1 med banana
LARGE helping Italian Pork Roast (LOTS of fat in there)
3/4 C Roasted Carrots
3/4 C Cauliflower Rice Pilaf
1/4 C Pork Roast
1 C mixed blackberries and blueberries
9-10 raw almonds
Large helping Well Fed Chicken Nanking (chicken, green beans, sweet potato)Late Snack
1/2 C Pork Roast
handful of almonds
handful of pistachios
handful of dried cranberries (GAH! These had added sugar! My first slip.)
2 C Pork roast
1 C Spaghetti Squash
3/4 of a banana
1 large strawberry
3 1/2 C Chicken Nanking (chicken, green beans, sweet potato)
1 large banana
7 StrawberriesMeal 3
Two 1" pork meatballs
Well Fed Country captain chicken (3/4 of an extra large chicken breast; 3/4 C veggies and sauce (bell peppers, onion, green onion, chicken broth, sm amt of raisins, sugar free bacon, almonds, coconut oil)
1.5 C spinach salad with chicken, egg, cashews, avocado, onion, dressed with olive oil, lemon juice
Over the rest of the 38 days, I've eaten a variety of pork, beef, lamb, chicken, eggs, and veggies like roasted carrots and cauliflower, spaghetti squash, spinach salads, lettuce salads, lettuce wraps, onion, and lots of avocado. Cooking (and roasting) is mostly with coconut oil or ghee.